Speed-indicator.



' No. 863,166. PATENTED AUG. 13, 1907.

W. A. FOGBLBERG.

SPEED INDICATOR.

.APPLIOATION FILED DEC. 5. 1906.

M6666; MW,

WILHELM AUGUST FOGELBERG, OF CHICAGO, ILLINOIS.

SPEED-INDICATOR.

Specification of Letters Patent.

Patented Aug. 13, 1907.

Application filed December 5, 1906. Serial No. 346,397.

To all whom it may concern: I

Be it known that I, WILHELM AUoUsr FOGELBERG, a subject of the King ofSweden, and a resident of Chicage, in the county of Cool; and State ofIllinois, and United States of America, have invented certain new anduseful Improvements in Speed-Indicators, of which the following is aspecification.

' This invention relates to speed indicators of the centrifugal type.

The main object of this invention is to provide an improved form ofspeed indicator which is capable of accurately indicating a large rangeof speeds, which is positive in its operation and unaffected in itsaccuracy by the work of overcoming friction of its own parts even whenit is called upon to simultaneously operate a number of registering orrecording devices.

A further object is to provide a speed indicator which is equallyaccurate at all speeds throughout its range, and which is capable ofbeing proportioned to suit any desired range of speeds. 7

These objects are accomplished by the device shown in the accompanyingdrawing which represents diagrammatically a speed indicating mechanismembodying this invention.

The illustration is confined to important features of the mechanism, thesupporting frame and some of the minor details of construction beingomitted so as to give a clear id ca of the essential features of theinvention.

In the drawing, the member whose speed changes are to be indicated isthe shaft 1 or some part driven thereby. A friction wheel or disk 2 ismounted on the shaft 1 and has friction engagement with the periphery ofa second wheel 3 which is journale'd on a frame 4 mounted to shiftradially of the wheel 2 for moving the wheel 3 toward and away from theaxis of said wheel 2.

Such portions of the supporting frame as are shown are designated 5 inthe drawings. The friction wheel 3 engages a third friction wheel 6which in turn drives a fourth friction wheel 7. The wheel 7 is splinedto a driven shaft 8 rotatably mounted in the supporting frame 5 andsecured against longitudinal shifting therein. The friction wheel 7 isalso controlled in its position with reference to the axis of the wheel6 by the frame 4. The system of friction wheels is arranged so as toincrease the speed of the driven shaft Swhen the frame 4 moves away fromthe axis of the shaft or I to decrease the speed of said driven shaftwhen the frame moves toward said axis.

The driven shaft 8 has a sleeve 9 splined at its upper end and normallyurged upward by means of a spring 10. A centrifugal ball governor 11carried by the shaft 8 tends to pull the sleeve 9 downward against theaction of the spring 10 when said shaft exceeds a certain speed ofrotation. The sleeve 9 carries at its upper end a friction wheel 12having oppositely disposed conical surfaces.

rotation of the shaft 1 drives the shaft 8.

The frame 4 is shifted by means of a threaded shaft 13 which isrotatably mounted in the frame 5 and secured against longitudinalshifting therein. The shaft 13 meshes with an internally threadedportion of the frame 4. The shaft 13 carries at its upper end a pair offriction cones 14 and 15, the cone 14 being adapted to have frictionalcontact with the friction roller 12 when the governor pulls the sleeve 9downward; and the friction roller 15 being adapted to be driven throughan intermediate friction roller 16, by the friction roller 12 when saidroller 12 is lifted by the spring 10 through a reduction in thespeedof'the shaft 8. The frame 4 carries a pointer 17 which is moved along agraduated scale 18 through the shifting of the member 4 and therebyindicates changes in the speed of the shaft 1 as will be hereinafterdescribed. The cord 19 passing over the pulley 20 indicates a connectionfor operating a distant indicator or speed recording mechanism notshown.

The operation of the device shown is as follows: The If the speed of theshaft 1 is insufficient to cause the balls of the governor 11 t0 flyoutward against the action of the spring 10, then said spring will urgethe friction wheel .12 into position for engaging the intermediatefriction roller 16 and will thus cause the shaft 13 to rotate so as tomove the frame 4 away from the axis of the disk 2, causing the shaft 8to increase its speed. This action would continue until the speed of theshaft 8 were such as to cause the balls of the governor to fly outwardand pull I thefrictionwheel 12 into contact with the friction wheel 14.As there is no intermediate wheel in this case, the direction ofrotation of the shaft 13 would now be opposite to that imparted by thefriction wheel 15. This action causes the frame 4 to shift the wheel 3toward the axis of the shaft 1. As the action of the threaded shaft 13is to shift the frame 4 so as to counteract an increase or decrease ofspeed of the shaft 8, the various parts of the mechanism automaticallyadjust themselves so that the governor will rotate at a uniform speedand keep the friction roller 12 out of mesh with either the rollers 14or 16. There is thus a certain position of the frame 4 which correspondsto each speed of the shaft 1.

If the speed of the shaft 1 increases, then such increase of speedoperates upon the governor 11 so as to lower the frame 4. Similarly areduction in the speed of the shaft 1 will cause the governor to operatethe shaft 13 so as to raise the frame 4. Since the sleeve 9 is splinedto the shaft 8, the shaft 13 will be positively driven by the frictionmechanism connecting it with the shaft 1 and the power available foroperating registering and recording devices is much greater than that ofthe centrifugal action of the governor.

The indication of' the device is equally accurate 1 throughout theentire range of the movement of the frame 4 and the device is thus freefrom the most serious defects of the usual form of centrifugal speedindicator, in which the indicating devices are operated directly by theoutward or inward movement of the weights of the centrifugal governor.In this case the movement of the weights of the governor merely throwsthe positively driven shifting mechanism into and out of operation. Itis therefore possible by the herein'described mechanism tosimultaneously operate a'multiplicitypf indicating devices withoutreducing the accuracy of the indications. i

The train of friction wheels connecting the shafts 1 and 8 is soarranged that the governor is extremely sensitive to slight variationsin the speed of the shaft 1.

--What I claim as my invention and desire to secure by Letters Patentis:

-1. The combinationv of a friction wheel, a second friction wheel havingdriving contact with the first and movable toward. and away from theaxis of said first wheel while in driving contact therewith, acentrifugal. governor operated by said second wheel, and meanscontrolled by said governor and adapted to, shift said second wheel awayfrom the axis of the first through a decrease in the speed of saidfirstwheel and to shift said second wheel toward the axis of said first wheel.throughan increase of the speed thereof.

2. The combination of a friction wheel, a second friction wheel havingdriving contact with the first and movable toward and away from the axisof said first wheel while in driving contact therewith, a centrifugalgovernor operated'by said second wheel, means operated by said gov ernorand adapted to shift said second wheel away from the axis of the firstthrough a decrease in the speed of said first wheel and to shift saidsecond wheel toward the axis of said firstwheel through an increase inthe speed thereof, and an indicator operated through the shifting ofsaid second wheel and adapted to indicate a change in speed of saidfirst wheel.

3. The combination of a friction whel, a second friction wheel incontact with the first and movable toward and away from the axis thereoffor. varying the relative speeds of said wheels, a governor driven bysaid second .wheel, and power-driven mechanism controlled by said-governor for positively shifting said second wheel so as to maintain asubstantially uniform speed of said governor regardless of changes inthe speed of said first wheel.

4. .The combination of a friction wheel, a second friction wheel incontact with the first and vm ovable toward and away from the axisthereof for varying the relative speeds of said wheels, a governordriven by said second wheel, and power-driven mechanism controlled bysaid governor for positivelyshifting said second wheel so as to maintaina substantially uniform speed of said governor regardless of changes inthe speed of said first-wheel, and anindi eating device controlled bysaid mechanism for indicatingchanges in the speed of said first wheel.

5. The combination of a friction wheel, a second friction wheel indriving contact with the first, means for moving said second wheeltoward and away from the axis of said first wheel for changing therelative speeds ofsaid wheels, a governor drivenby said second wheel, ascrew threaded shaft operating said shifting means and adapted whenrotated in opposite directions to shift. said second wheel respectivelytoward and away from the axis of said first wheel, and means controlledby said governor and adapted to rotatesaid shaft in one directionthrough an increase of speed of the governor and to rotate said shaft inthe opposite direction through-a decrease in the speed of the governor,-said last means being arranged totpermit said governor to rotate at acertain predetermined speed without affecting the rotation of saidshaft, and all being arranged to cause said second wheel to shift towardthe axisof said first wheel through an increase in the speed of saidfirst wheel and to shift away from said axis through a reduction in thespeed of said first wheel.

G. The combination of a friction wheel, a second friction move saidsecond wheel toward and away from the axis of said first wheel forchanging the relative speeds of said,

wheels, a governor driven by said second wheel, a screwthreaded shaftoperating said shifting means and adapted when rotated in Oppositedirections to shift said second wheel respectively towardand away fromthe axis of said first wheel, meanscontrolled by said governor andadapted to rotate said shaft in one direction through an increase ofspeed of the governor and to rotate said shaft in the opposite directionthrough a decrease in the speed of the governor, said last means beingarranged to permit said governor to rotate'at a certainpredeterminedsp'eed without affecting the rotation of said shaft, allbeing arranged to cause said second wheel toshift toward the axis ofsaid first wheel through an increase in the speed of said first -wheeland to shift away from said axis through a reduction in the speed'ofsaidfirst wheel, and an indicating device operated by said shaft forindicating changes in the speed of said first wheel.

7. The combination of a friction wheel, a'sec'ond friction wheel havingdriving contact with one face of the first wheel and mountedtomovetoward and away from the axis thereof, while in contact therewith, acentrifugal governor driven by said second wheel, a movable frame ar-,

ranged for shifting said second wheel, a .threaded shaft having threadedengagement with said frame for shifting the same through the rotation ofsaid shaft, friction mechanism arranged for driving said shaft inopposite directions through the expansion'and contraction ofsaidgovernor under changes of speed, all being arranged to cause saidsecond wheel to shift toward the axis of said shaft through an increasein the speed thereof, and to shift away from the axis of said shaftthrough'a decrease in the speed thereof.

tions through the expansion and contraction of said governor underchanges of speed, all being arranged to cause- 'wheel in driving contactwith the first, meansadapted to said second wheel to shift toward theaxis of said shaft I through an increase in the speed thereof, andtoshift away from theaxis of said shaft through a decrease in the speed Ithereof, and an indicator operated by said shaft for indicating changesin the speed of said first wheel.

Signed at Chicago, this 1s t day of December, 1006/ WILHELM AUGUSTFOGELBERG.

Witnesses E. A. RUMMLER, Runow RnMMtna;

